// blanks out the username and password input fields
function empty_field(elem) {
	// check it exists
	if (elem) {
		elem.style.background = '#FFF';
	}
}

// blanks out the username and password input fields
function fill_field(elem) {
	// check it exists
	if (elem) {
		if (!elem.value>'') {
			if (elem.className=='text') {
				elem.style.background = '#FFF url(/images/bg-email.jpg) 0 0 no-repeat';
			} else if (elem.className=='search') {
				elem.style.background = '#FFF url(/images/bg-search.jpg) 0 0 no-repeat';
			} else {
				elem.style.background = '#FFF url(/images/bg-password.jpg) 0 0 no-repeat';
			}
		} else {
			empty_field(elem);
		}
	}
}